Mobile communication method and radio base station

Abstract

In Inter-eNB handover with “full configuration”, UL-PDCP-PDUs are handled appropriately. A mobile communication method according to the present invention includes, in Inter-eNB handover of a mobile station UE from a radio base station eNB# 1 to a radio base station eNB# 2 , the step of causing the radio base station eNB# 1 to discard all the UL-PDCP-PDUs having been successfully received, if the radio base station eNB# 2 instructs the mobile station UE to once delete all the configuration set between the mobile station UE and the radio base station eNB# 1.

The invention claimed is: 
     
       1. A mobile communication method of executing a handover of a mobile station from a cell under a first radio base station to a cell under a second radio base station,
 the method comprising the step of, in the handover, causing the first radio base station to discard all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received, if an identifier for a path for uplink data forwarding is not notified in a handover request acknowledgement signal sent by the second radio base station. 
 
     
     
       2. A mobile communication method of executing a handover of a mobile station from a cell under a first radio base station to a cell under a second radio base station,
 the method comprising the step of, in the handover, causing the first radio base station to deliver all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received to a gateway node, if an identifier for a path for uplink data forwarding is not notified in a handover request acknowledgement signal sent by the second radio base station. 
 
     
     
       3. A mobile communication method of executing a handover of a mobile station from a cell under a first radio base station to a cell under a second radio base station,
 the method comprising the step of, in the handover, if the second radio base station does not admit to establish an Radio Link Control-Acknowledged Mode (RLC-AM) bearer which is established between the first radio base station and the mobile station, causing the first radio base station to discard all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received via the RLC-AM bearer. 
 
     
     
       4. A mobile communication method of executing a handover of a mobile station from a cell under a first radio base station to a cell under a second radio base station,
 the method comprising the step of, in the handover, if the second radio base station does not admit to establish an Radio Link Control-Acknowledged Mode (RLC-AM) bearer which is established between the first radio base station and the mobile station, causing the first radio base station to deliver all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received via the RLC-AM bearer to a gateway node. 
 
     
     
       5. A mobile communication method of executing a handover of a mobile station from a cell under a first radio base station to a cell under a second radio base station,
 the method comprising the steps of, in the handover, if the second radio base station does not admit to establish an Radio Link Control-Acknowledged Mode (RLC-AM) bearer which is established between the first radio base station and the mobile station, 
 causing the first radio base station to forward all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received via the RLC-AM bearer to the second radio base station; and 
 causing the second radio base station to deliver the received UL-PDCP-PDUs to a gateway node. 
 
     
     
       6. A radio base station capable of operating as a first radio base station in a handover of a mobile station from a cell under the first radio base station to a cell under a second radio base station,
 the radio base station comprising a control unit configured to, in the handover, discard all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received if an identifier for a path for uplink data forwarding is not notified in a handover request acknowledgement signal sent by the second radio base station. 
 
     
     
       7. A radio base station capable of operating as a first radio base station in a handover of a mobile station from a cell under the first radio base station to a cell under a second radio base station,
 the radio base station comprising a transmission unit configured to, in the handover, deliver all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received to a gateway node, if an identifier for a path for uplink data forwarding is not notified in a handover request acknowledgement signal sent by the second radio base station. 
 
     
     
       8. A radio base station capable of operating as a first radio base station in a handover of a mobile station from a cell under the first radio base station to a cell under a second radio base station,
 the radio base station comprising a control unit configured to, in the handover, if the second radio base station does not admit to establish an Radio Link Control-Acknowledged Mode (RLC-AM) bearer which is established between the first radio base station and the mobile station, discard all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received via the RLC-AM bearer. 
 
     
     
       9. A radio base station capable of operating as a first radio base station in a handover of a mobile station from a cell under the first radio base station to a cell under a second radio base station,
 the radio base station comprising a transmission unit configured to, in the handover, if the second radio base station does not admit to establish an Radio Link Control-Acknowledged Mode (RLC-AM) bearer which is established between the first radio base station and the mobile station, deliver all Uplink-Packet Data Convergence-Protocol Data Units (UL-PDCP-PDUs) having been successfully received via the RLC-AM bearer to the second radio base station or a gateway node.